<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>【案例】倒计时</title>
    <script>
        function countDown(time){
            var nowTime = +new Date();
            var inputTime = +new Date(time);
            var times = (inputTime - nowTime) / 1000;
            var d = parseInt(times / 60 / 60 /24);
            d = d < 10 ? '0' + d : d;
            var h = parseInt(times / 60 / 60 %24);
            h = h < 10 ? '0' + h : h;
            var m = parseInt(times /60 % 60);
            m = m < 10 ? '0' + m : m;
            var s = parseInt(times % 60);
            s = s < 10 ? '0' + s : s;
            return d + '天' + h + '时' + m + '分' + s + '秒';
        }
        console.log(countDown('2049-9-24 9:42:55'));
    </script>
</head>
<body>

</body>
</html>